(1H-indol-1-yl)-2-(amino)acetamides and related (1H-indol-1-yl)-(aminoalkyl)amides

ABSTRACT

There are disclosed compounds having the formula ##STR1## wherein X, Y, Z and R 1  -R 6  are defined in the specification and pharmaceutically acceptable addition salts thereof, or where applicable, the optical or geometrical isomers or racemic mixtures thereof, intermediates in the process for making the compounds, a process for making the compounds and pharmaceutical compositions and method of use as neuroprotective agents.

This is a division of a prior application Ser. No, 863,273, filed Apr.3, 1992, now U.S. Pat. No. 5,319,096.

This invention relates to compounds having the formula ##STR2## whereinX is hydrogen, chloro, bromo, fluoro, hydroxy, loweralkoxy,arylloweralkoxy, acyloxy, loweralkylaminocarbonyloxy,diloweralkylaminocarbonyloxy, amino, loweralkylamino, diloweralkylamino,acylamino, loweralkyl or trifluoromethyl;

Y is hydrogen, loweralkyl, chloro or bromo;

Z is hydrogen, loweralkyl, loweralkoxy or halogen; or X and Z takentogether can form a methylenedioxy group;

R¹ is hydrogen, loweralkyl, arylloweralkyI, carboxyloweralkyl,arylloweralkoxycarbonylloweralkyl or loweralkoxycarbonylloweralkyl;

R² is hydrogen, loweralkyl or hydroxyloweralkyl;

R³ is hydrogen or loweralkyl; or

R² and R³ together with the carbon to which they are attached form (C₃-C₇)cycloalkyl;

R⁴ is hydrogen or loweralkyl;

R⁵ is hydrogen, loweralkyl, aryl, arylloweralkyl, acyl,arylloweralkoxycarbonyl, loweralkoxycarbonyl or aryloxycarbonyl;

R⁶ is hydrogen, chloro, bromo, arylcarbonyl, loweralkylcarbonyl,aryl(hydroxy)alkyl or hydroxyalkyl; and

m and n are independently 0 to 5 with the proviso that the sum of m plusn is not greater than 5;

and pharmaceutically acceptable addition salts thereof, or whereapplicable, the optical or geometrical isomers or racemic mixturesthereof.

This invention also relates to pharmaceutical compositions of thecompounds and a method of use as neuroprotective agents, a process formaking the compounds and intermediate compounds used in the process.

Throughout the specification and the appended claims, a given chemicalformula or name shall encompass all stereo, geometrical and opticalisomers thereof where such isomers exist, as well as pharmaceuticallyacceptable acid addition salts thereof.

The following definitions shall apply throughout the specification andthe appended claims.

Unless otherwise stated or indicated, the term loweralkyl ,denotes astraight or branched alkyl group having from 1 to 6 carbon atoms, suchas, for example, methyl, ethyl, n-propyl, isopropyl, isobutyl, n-butyl,t-butyl, sec-butyl, pentyl and hexyl.

Unless otherwise stated or indicated, the term cycloalkyl denotes analicyclic hydrocarbon group containing 3 to 7 carbon atoms such as, forexample, cyclopropyl, cyclopentyl, cyclohexyl and cycloheptyl.

Unless otherwise stated or indicated the term halogen means fluorine,chlorine, bromine or iodine.

Unless otherwise stated or indicated, the term aryl shall meanunsubstituted phenyl or phenyl substituted with 1, 2 or 3 substituentsindependently selected from loweralkyl, halogen, trifluoromethyl,loweralkoxy or hydroxy.

Unless otherwise stated or indicated, the term acyl shall mean formyl orloweralkylcarbonyl such as, for example, methylcarbonyl (acetyl).

In a preferred embodiment of this invention are compounds of the formula##STR3## wherein X is hydrogen, chloro, bromo, fluoro, hydroxy,loweralkoxy, arylloweralkoxy, acyloxy, loweralkylaminocarbonyloxy,diloweralkylaminocarbonyloxy, amino, loweralkylamino, diloweralkylamino,acylamino, loweralkyl or trifluoromethyl;

Y is hydrogen, loweralkyl, chloro or bromo;

Z is hydrogen, loweralkyl, loweralkoxy or halogen; or X and Z takentogether can form a methylenedioxy group;

R¹ is hydrogen, loweralkyl, arylloweralkyl, carboxyloweralkyl,arylloweralkoxycarbonylloweralkyl or loweralkoxycarbonylloweralkyl;

R² is hydrogen, loweralkyl or hydroxyloweralkyl;

R³ is hydrogen or loweralkyl; or

R² and R³ together with the carbon to which they are attached form (C₃-C₇)cycloalkyl;

R⁶ is hydrogen, chloro, bromo, arylcarbonyl, loweralkylcarbonyl,aryl(hydroxy)loweralkyl or hydroxyloweralkyl;

m and n are independently 0 to 2; and

pharmaceutically acceptable salts thereof.

More preferably

X is hydrogen, chloro, hydroxy, methoxy, phenylmethoxy orN-methylaminocarbonyloxy;

Y is hydrogen, chloro or methyl;

Z is hydrogen;

R¹ is hydrogen, methyl or carboxymethyl;

R² is hydrogen, methyl or hydroxymethyl;

R³ is hydrogen;

R⁶ is hydrogen, chloro, bromo, methylcarbonyl, phenylcarbonyl,halophenylcarbonyl, methoxyphenylcarbonyl, methylphenylcarbonyl or(trifluoromethylphenyl)carbonyl; and

m and n are independently 0 or 1; and

pharmaceutically acceptable salts thereof.

Most preferable are compounds of this embodiment wherein

X is hydrogen, 5-chloro, 5-methoxy, 5-phenylmethoxy or5-(N-methylaminocarbonyloxy);

Y is hydrogen or methyl;

R¹ is hydrogen, methyl or carboxymethyl;

R² is hydrogen, methyl or hydroxymethyl;

R³ is hydrogen;

R⁶ is hydrogen, chloro, bromo, methylcarbonyl, phenylcarbonyl,(2-methylphenylcarbonyl, (2-methoxyphenyl)carbonyl,(2-fluorophenyl)carbonyl, (4-fluorophenyl)carbonyl,(3-fluorophenyl)carbonyl or (2-trifluoromethylphenyl)carbonyl;

m and n are each 0; and

hydrochloride salts thereof.

In another preferred embodiment of the inventions are compounds of theformula ##STR4## wherein X is hydrogen, chloro, bromo, fluoro, hydroxy,loweralkoxy, arylloweralkoxy, acyloxy, loweralkylaminocarbonyloxy,diloweralkylaminocarbonyloxy, amino, loweralkylamino, diloweralkylamino,acylamino, loweralkyl or trifluoromethyl;

Y is hydrogen, loweralkyl, chloro or bromo;

Z is hydrogen, loweralkyl, loweralkoxy or halogen; or X and Z takentogether can form a methylenedioxy group;

R¹ is hydrogen, loweralkyl, arylloweralkyl, carboxyloweralkyl,arylloweralkoxycarbonylloweralkyl or loweralkoxycarbonylloweralkyl;

R² is hydrogen, loweralkyl or hydroxyloweralkyl;

R³ is hydrogen or loweralkyl; or

R² and R³ together with the carbon to which they are attached form (C₃-C₇)cycloalkyl;

R⁴ is hydrogen or loweralkyl;

R⁵ is hydrogen, loweralkyl, aryl, arylloweralkyl, acyl,arylloweralkoxycarbonyl, loweralkoxycarbonyl or aryloxycarbonyl;provided R⁴ and R⁵ are not simultaneously hydrogen;

R⁶ is hydrogen, chloro, bromo, arylcarbonyl, loweralkylcarbonyl,aryl(hydroxy)loweralkyl or hydroxyloweralkyl; and

m and n are independently 0 to 2; and

pharmaceutically acceptable addition salts thereof or, where applicable,the optical or geometrical isomers or racemic mixtures thereof.

More preferably

X is hydrogen, chloro, hydroxy, methoxy, phenylmethoxy orN-methylaminocarbonyloxy;

Y is hydrogen or methyl;

Z is hydrogen;

R¹ is hydrogen, methyl or phenylmethoxycarbonylloweralkyl;

R² is hydrogen, methyl or hydroxymethyl;

R³ is hydrogen;

R⁴ is hydrogen or methyl;

R⁵ is loweralkoxycarbonyl or arylloweralkoxycarbonyl;

R⁶ is hydrogen, chloro, bromo, methylcarbonyl, phenylcarbonyl,loweralkylphenylcarbonyl, halophenylcarbonyl, loweralkoxyphenylcarbonylor trifluoromethylphenylcarbonyl;

m and n are independently 0 or 1; and

pharmaceutically acceptable salts thereof.

Most preferable are compounds of this embodiment wherein

X is hydrogen, 5-chloro, 5-hydroxy, 5-methoxy, 5-phenylmethoxy or5-(N-methylaminocarbonyloxy);

Y is hydrogen or methyl;

R¹ is hydrogen, methyl or phenylmethyoxycarbonylmethyl;

R² is hydrogen, methyl or hydroxymethyl;

R³ is hydrogen;

R⁴ is hydrogen;

R⁵ is t-butoxycarbonyl or phenylmethoxycarbonyl;

R⁶ is hydrogen, chloro, bromo, methylcarbonyl, phenylcarbonyl,(2-methylphenyl)carbonyl, (2-methoxyphenyl)carbonyl,(2-fluorophenyl)carbonyl, (4-fluorophenyl)carbonyl,(3-fluorophenyl)carbonyl, or (2-trifluoromethylphenyl)carbonyl.

m and n are each 0; and

pharmaceutically acceptable salts thereof.

Also encompassed by this invention are intermediate compounds of theformula ##STR5## wherein X is hydrogen, chloro, bromo, fluoro, hydroxy,loweralkoxy, arylloweralkoxy, acyloxy, loweralkylaminocarbonyloxy,diloweralkylaminocarbonyloxy, amino, loweralkylamino, diloweralkylamino,acylamino, loweralkyl or trifluoromethyl;

Y is hydrogen, loweralkyl, chloro or bromo;

Z is hydrogen, loweralkyl, loweralkoxy or halogen; or X and Z takentogether can form a methylenedioxy group;

R⁶ is hydrogen, chloro, bromo, arylcarbonyl, loweralkylcarbonyl,aryl(hydroxy)loweralkyl or hydroxyloweralkyl; and

R⁹ is hydrogen, formyl, loweralkylcarbonyl, loweralkoxycarbonyl,phenylcarbonyl or carboxyphenylcarbonyl; and

R¹⁰ is hydrogen; or

R⁹ and R¹⁰ together with the nitrogen to which they are attached arephthalimidoyl.

In one embodiment of the intermediates are compounds of the formula##STR6## wherein X is hydrogen, fluoro, hydroxy, loweralkoxy,arylloweralkoxy, acyloxy, loweralkyl or trifluoromethyl;

Y is hydrogen or loweralkyl;

R⁶ is hydrogen, arylcarbonyl, loweralkylcarbonyl,aryl(hydroxy)loweralkyl or hydroxyloweralkyl; and

R⁹ is Ioweralkylcarbonyl, loweralkoxycarbonyl, phenylcarbonyl orcarboxyphenylcarbonyl.

More preferably,

X is hydrogen, hydroxy, methoxy or phenylmethoxy;

Y is hydrogen or methyl;

R⁶ is hydrogen, aryl(hydroxy)loweralkyl or hydroxyloweralkyl; and

R⁹ is butylcarbonyl, t-butyoxycarbonyl, phenylcarbonyl orcarboxyphenylcarbonyl.

Most preferably,

X is hydrogen, 5-methoxy or 5-phenylmethoxy;

Y is hydrogen or methyl; and

R⁶ is hydrogen, hydroxymethyl or 1-(hydroxy)ethyl; and

R⁹ is t-butylcarbonyl, t-butoxycarbonyl, phenylcarbonyl orcarboxyphenylcarbonyl.

In another embodiment of the intermediates are compounds of the formula##STR7## wherein X is hydrogen, chloro, bromo, fluoro, hydroxy,loweralkoxy, arylloweralkoxy, acyloxy, loweralkyl or trifluoromethyl;

Y is hydrogen or loweralkyl; and

R⁶ is hydrogen, arylcarbonyl or loweralkylcarbonyl.

More preferably,

X is hydrogen, chloro, hydroxy, methoxy or phenylmethoxy;

Y is hydrogen or loweralkyl; and

R⁶ is hydrogen, methylcarbonyl, phenylcarbonyl, halophenylcarbonyl,methoxyphenylcarbonyl, methylphenylcarbonyl or(trifluoromethylphenyl)carbonyl.

Most preferably,

X is hydrogen, 5-chloro, 5-methoxy or 5-phenylmethoxy;

Y is hydrogen or methyl; and

R⁶ is hydrogen, methylcarbonyl, phenylcarbonyl,(2-methylphenyl)carbonyl, (2-methoxyphenyl)carbonyl,(2-fluorophenyl)carbonyl, (4-fluorophenyl)carbonyl,(3-fluorophenyl)carbonyl or (2-trifluoromethylphenyl)carbonyl.

In yet another embodiment of the intermediates are compounds of theformula ##STR8## where X is hydrogen, chloro, bromo, fluoro, hydroxy,loweralkoxy, arylloweralkoxy, acyloxy, loweralkyl or trifluoromethyl;

Y is hydrogen, loweralkyl, chloro or bromo; and

R⁶ is hydrogen, chloro, bromo, arylcarbonyl or loweralkylcarbonyl;

More preferably,

X is hydrogen, chloro, fluoro, hydroxy, methoxy or phenylmethoxy;

Y is hydrogen, methyl, chloro or bromo; and

R⁶ is hydrogen, chloro, bromo, methylcarbonyl, phenylcarbonyl,halophenylcarbonyl, methoxyphenylcarbonyl, methylphenylcarbonyl ortrifluoromethylphenylcarbonyl;

Most preferably,

X is hydrogen, 5-chloro, 5-methoxy, 5-hydroxy or 5-phenylmethoxy;

Y is hydrogen, chloro, bromo or methyl; and

R⁶ is hydrogen, chloro, bromo, methylcarbonyl, phenylcarbonyl,(2-methylphenyl)carbonyl; (2-methoxyphenyl)carbonyl,(2-fluorophenyl)carbonyl, (4-fluorophenyl)carbonyl,(3-fluorophenyl)carbonyl or (2-trifluoromethylphenyl)carbonyl.

Examples of compounds of the invention include:

[N-(1H-indol-1-yl)-2-amino]acetamide;

[N-(1H-indol-1-yl)-2-amino]propionamide;

[N-(1H-indol-1-yl)-2-amino-2-(hydroxymethyl)]acetamide;

[N-(3-methyl-1H-indol-1-yl)-2-amino]acetamide;

[N-methyl-N-(1H-indol-1-yl)-2-amino]acetamide;

[N-(2-chloro-3-methyl-1H-indol-1-yl)-2-amino]acetamide;

[N-(5-methoxy-1H-indol-1-yl)-2-amino]acetamide;

N-(5-phenylmethoxy-1H-indol-1-yl)-2-amino]acetamide;

[N-(5-hydroxy-1H-indol-1-yl)-2-amino]acetamide.

[N-[5-[N-(methyl)aminocarbonyloxy]-1H-indol-1-yl]amino]acetamide;

[N-(2-acetyl-3-methyl-1H-indol-1-yl)-2-amino]acetamide;

[N-(5-chloro-1H-indol-1-yl)-2-amino]acetamide;

[N-(2-(2-fluorobenzoyl)-3-methyl-1H-indol-1-yl)-2-amino]acetamide;

[N-(2-benzoyl-3-methyl-1H-indol-1-yl)-2-amino]acetamide;

[N-(1H-indol-1-yl)-2-(carbamic acid, t-butyl ester)]acetamide;

[N-(1H-indol-1-yl)-2-(carbamic acid, phenylmethyl ester)]acetamide;

[[N-(1H-indol-1-yl)-2-(carbamic acid, phenylmethylester)]acetamide]acetic acid, phenylmethyl ester;

[N-(5-chloro-1H-indol-1-yl)-2-(carbamic acid, t-butyl ester)]acetamide;

[N-(1H-indol-1-yl)-2-(carbamic acid, phenylmethylester)-2-(hydroxymethyl)]acetamide;

[[N-(3-methyl-1H-indol-1-yl)]-2-(carbamic acid, t-butylester)]acetamide;

[N-(1H-indol-1-yl)-2-(carbamic acid, t-butyl ester)]propionamide;

[[N-(3-methyl-1H-indol-1-yl)]-2-(carbamic acid, phenylmethylester)]acetamide;

[[N-(methyl)-N-(1H-indol-1-yl)]-2-(carbamic acid, phenylmethylester)]acetamide;

[[N-(2-chloro-3-methyl-1H-indol-1-yl)]-2-(carbamic acid, phenylmethylester)]acetamide;

[[N-(2-chloro-3-methyl-1H-indol-1-yl)]-2-(carbamic acid, t-butylester)]acetamide;

[N-(5-methoxy-1H-indol-1-yl)-2-(carbamic acid, phenylmethylester)]acetamide;

[N-(5-phenylmethoxy-1H-indol-1-yl)-2-(carbamic acid, phenylmethylester)]acetamide;

[N-5-methoxy-3-methyl-1H-indol-1-yl)-2-amino]acetamide;

[N-5-phenylmethoxy-3-methyl-1H-indol-1-yl]-2-amino]acetamide;

[N-5-hydroxy-3-methyl-1H-indol-1-yl]-2-amino]acetamide;

[N-(5-phenylmethoxy-1H-indol-1-yl)-2-(carbamic acid, t-butylester)]acetamide;

[N-(5-hydroxy-l H-indol-1-yl)-2-(carbamic acid, phenylmethylester)]acetamide;

[N-[5-[N-(methyl)aminocarbonyloxy]-1H-indol-1-yl]-2-(carbamic acid,phenylmethyl ester)]acetamide;

[N-(2-acetyl-3-methyl-1H-indol-1-yl)-2-(carbamic acid, phenylmethylester)]acetamide;

[N-[2-(2-fluorobenzoyl)-3-methyl-1H-indol-1-yl]-2-carbamic acid,phenylmethyl ester)]acetamide;

[N-(2-benzoyl-3-methyl-1H-indol-1-yl)-2-(carbamic acid phenylmethylester)]acetamide;

[N-(2-benzoyl-3-methyl-1H-indol-1-yl)-2-amino]acetamide;

[N-(1H-indol-1-yl)-2-amino]cyclopropanecarboxamide;

[N-(1H-indol-1-yl)-2-(carbamic acid, t-butylester)]cyclopropanecarboxamide;

[N-(1H-indol-1-yl)-2-amino]ethanecarboxamide;

[N-(1H-indol-1-yl)-2-amino]pentanecarboxamide;

[N-(3-methyl-1H-indol-1-yl)-2-amino]ethanecarboxamide;

[N-(3-methyl-1H-indol-1-yl)-2-amino]pentanecarboxamide;

[N-(5,6-dimethoxy-1H-indol-1-yl)-2-amino]acetamide;

[N-(5,7-dimethoxy-1H-indol-1-yl)-2-amino]acetamide;

[N-(5-ethoxy-1H-indol-1-yl)-2-amino]acetamide;

[N-(5,6-methylenedioxy-1H-indol-1-yl)-2-amino]acetamide;

[N-(5-methylcarbonylamino-1H-indol-1-yl)-2-amino]acetamide;

[N-(5-dimethylamino-1H-indol-1-yl)-2-amino]acetamide; and

[N-(1H-indol-1-yl)-2-(N-methylcarbamic acid, t-butyl ester)]acetamide.

The compounds of this invention are prepared by using one or more of thesteps described in the reaction schemes below. Throughout thedescription of the synthetic steps, the definitions of X, Y, Z and R¹through R⁶ are as given above unless otherwise stated or indicated.

More particularly, as shown in Reaction Scheme A, an aminoindole ofFormula II is reacted with a compound of Formula III (wherein R⁷ isloweralkyl or arylloweralkyl) in the presence of a condensing agent suchas dicyclohexylcarbodiimide (DCC) to yield a compound of Formula IV,wherein R⁷ is loweralkyl or arylloweralkyl.

Typically, the reaction is carded out in a suitable solvent such as anaprotic organic solvent, for example, chloroform, dichloromethane,dioxane, or tetrahydrofuran, at a temperature of from about 0° C. toabout 100° C., preferably from about 15° C. to about 80° C., morepreferably from about 20° C. to about 50° C.

The compound of Formula IV is deprotected by means known in the art. Inthe case where R⁷ is phenylmethyl, the compound of Formula IV isdeprotected, for example, by treatment with hydrogen in the presence ofa catalyst such as palladium on carbon to yield the amino compound ofFormula I. The reaction is typically carried out in a polar solvent suchas methanol or ethanol at about 0° C. to 50° C., preferably from about15° C. to about 30° C.

When R⁷ of Formula IV is t-butyl, the compound is deprotected to yieldthe corresponding amino compound, for example, by treatment with acidsuch as hydrochloric acid, hydrobromic acid or trifluoroacetic acid, inan organic solvent such as ethyl acetate, tetrahydrofuran, chloroformand the like, or neat, at from about -50° C. to about 100° C.Preferably, the reaction is carded out in the presence of hydrochloricacid in ethyl acetate at about -15° C. to about 30° C.

In the case where it is preferred that R¹ of Formula I is not hydrogen,the compound of Formula IV is reacted with an appropriate alkylatingagent, for example, benzyl 2-bromoacetate, benzyl bromide oriodomethane, in the presence of an agent ##STR9## such as 40% KF onalumina or another suitable base to yield a compound of Formula Vwherein R¹ is not hydrogen.

The reaction is typically carried out in a suitable organic solvent suchas acetonitrile at a temperature of from about 0° C. to about 100° C.,preferably from about 15° C. to about 80° C., most preferably from about10° C. to about 50° C.

The compound of Formula V is deprotected essentially as described aboveto obtain the compound of Formula I wherein R¹ is not hydrogen.

The compound of Formula IV where R⁶ is hydrogen and Y is lower alkyl isreacted with a halogenating agent such as, for example,N-chlorosuccinimide or N-bromosuccinimide, optionally in the presence ofa catalyst such as azobis(isobutyronitrile) to obtain a compound ofFormula VI wherein R⁶ is chlorine or bromine. The reaction is generallycarried out in a suitable organic solvent such as dimethylformamide at atemperature from about 0° C. to about 100° C., preferably from about 15°C. to about 50° C.

The compound of Formula VI wherein R⁷ is t-butyl is deprotected toprovide the compound of Formula I wherein R⁶ is halogen, essentially inthe same manner as the deprotection of the compound of Formula IVwherein R⁷ is t-butyl and R⁶ is hydrogen, to provide the compound ofFormula I wherein R⁶ is hydrogen. ##STR10##

The compounds of Formula II wherein R⁶ is arylcarbonyl or alkylcarbonylare prepared from the compound of Formula II wherein R⁶ is hydrogen asshown in Reaction Scheme B. The compound of Formula II wherein R⁶ ishydrogen is reacted with phthalic anhydride optionally in the presenceof base such as triethylamine to yield a compound of Formula VII. Thereaction is generally carried out in a suitable solvent such as, forexample, methylene chloride or chloroform at a temperature of from about-30° C. to about 100° C., preferably from about 0° C. to about 65° C.

The compound of Formula VII is treated with a suitable condensing agentsuch as DCC in the presence of a catalyst such as, for example,dimethylaminopyridine (DMAP) or pyrrolidinopyridine to obtain thephthalimido compound of Formula VIII. The reaction is generally carriedout in a suitable solvent such as chloroform at a temperature of fromabout 0° C. to about 100° C., preferably from about 15° C. to about 50°C.

The compound of Formula VIII is reacted with an acyl halide in thepresence of a catalyst, preferably tin (IV) chloride, to yield thecorresponding ketone of Formula IX. The reaction is generally carriedout in a suitable solvent such as chloroform at a temperature of fromabout -40° C. to about 80° C., preferably from about -20° C. to about25° C.

The compound of Formula IX is treated with a suitable base such as, forexample, methylamine or hydrazine, preferably methylamine, to remove thephthalimido group, yielding the corresponding 1-aminoindole of FormulaII wherein R⁶ is alkylcarbonyl or arylcarbonyl. The reaction isgenerally carried out in a polar organic solvent such as, for example,dimethylformamide, from about 0° C. to about 100° C., preferably fromabout 15° C. to about 50° C., most preferably from about 20° C. to about50° C.

In addition, as depicted in Reaction Scheme C, compounds of Formula IIwherein R⁶ is hydroxyalkyl or aryl(hydroxy)alkyl are prepared byreacting a compound of Formula II, wherein R⁶ is hydrogen withtrimethylacetyl chloride optionally in the presence of a base such astriethylamine to yield a compound of Formula XI. The reaction isgenerally carried out in a suitable solvent such as, for example,methylene chloride or chloroform, at a temperature of from about -30° C.to about 100° C., preferably from about 0° C. to about 65° C.

The compound of Formula XI is reacted with an aldehyde in the presenceof a base such as, for example, butyllithium to obtain the hydroxycompound of Formula X. The reaction is generally carried out in asuitable solvent such as, for example, dry tetrahydrofuran at atemperature of from about -70° C. to about 100° C., preferably fromabout -60° C. to about 25° C.

The compound of Formula X is then transformed to the compound of FormulaII wherein R⁶ is hydroxyalkyl or aryl(hydroxy)alkyl. ##STR11##

The compounds of the instant invention are useful as neuroprotectiveagents and as intermediates for making neuroprotective agents.

Glutamate, aspartate and other excitatory amino acids (EAA) are putativeneurotransmitters at vertebrate CNS excitatory synapses. This class ofneurotransmitters has also been shown to be neurotoxic (Coyle, J. T. andSchwarz, R., The Use of Excitatory Amino Acids as Selective Neurotoxins.In: Handbook of Chemical Neuroanatomy, Vol. 1: Methods in ChemicalNeuroanatomy, ed. Bjorklund, A., and Hokfelt, T., Elsevier SciencePublishers B.V., 1983, pp 508-527). The neurotoxicity of EAA has led tothe implication of their involvement in human neurodegenerativedisorders such as Alzheimer's Disease. Subacute or chronic overexposureto endogenous neurotoxin may lead to the slow degeneration of neurons(Olney, J., Excitotoxic Amino Acids and Neuropsychiatric Disorders.Annu. Rev. Pharmacol. Toxicol. 30:47-71, 1990). Competitive andnon-competitive EAA antagonists have been shown to have neuroprotectivepotential in several animal models. MK-801, a noncompetitive antagonistat the N-methyl-D-aspartate (NMDA) subtype of glutamate receptor,protected against neurodegeneration in the rat striatum caused byintracerebral infusion of NMDA. The competitive NMDA receptor antagonistCPP gave partial protection of striatal neurons when administered (100mg/kg, i.p.) 1 hour after infusion of quinolinate, a naturally occurringNMDA receptor agonist (Foster, A. C., Gill, R. and Woodruff, G. N.,Neuroprotective Effects of MK-801 in vivo: Selectivity and Evidence forDelayed Degeneration Mediated by NMDA Receptor Activation. J. Neurosci.8(12): 4745-4754, 1988). 7-Chlorokynurenate and HA-966, two selectiveantagonists of the glycine site on the NMDA receptor, offer significantneuroprotection against direct infusion of NMDA or quinolinate into therat striatum (Foster, A. C., Willis, C. L. and Tridgett, R., ProtectionAgainst N-methyl-D-aspartate Receptor-Mediated Neuronal Degeneration inRat Brain by 7-Chlorokynurenate and 3-amino-1-hydroxypyrrolid-2-one,Antagonists at the Allosteric Site for Glycine. Eur. J. Neurosci.2(3):270-277, 1989). NBQX, a selective antagonist at the quisqualatesubtype of glutamate receptor, protects against global ischemia in thegerbil (Sheardown, M. J., Nielsen, E. O., Hansen, A. J., Jacobsen, P.,Honore, T., 2,3-Dihydroxy-6-nitro-7-sulfamoyl-benzo(F)quinoxaline: ANeuroprotectant for Cerebral Ischemia. Nature 247:571-574, 1990). Thestriatal lesion paradigm can be used to assess the neuroprotectivepotential of novel compounds.

Testing of the compounds was carded out as follows: Male Sprague Dawleyrats (Charles River) are housed under standard laboratory conditions asoutlined in the "Guide for the Care and Use of Laboratory Animals"(National Institutes of Health Publications No. 85-23, Revised 1985).Food and water were provided ad libitum; lights were on from 0600-1800h. Sterile techniques were used during surgery.

Rats (250-320 g) were anesthetized with chloral hydrate (400 mg/kg i.p.,10 ml/kg) and mounted in a David Kopf® stereotaxic instrument. Anincision was made in the scalp and the skull surface was exposed. Allcoordinates were taken from the point on the skull where bregma meetsfile midline suture. The adjustable incisor bar was set at 3.3 mm belowhorizontal but may be adjusted. A 1-2 mm burr hole in the skull was madewith a dental drill 0.5 mm anterior to bregma and 3.0 mm lateral fromthe midline (Paxinos, G. and Watson, C., The Rat Brain in StereotaxicCoordinates. New York: Academic Press, 2^(nd) ed., 1986). A 30-gaugecannula (1 inch length, point #4) was fitted to a 5 μl Hamilton® syringeand was slowly lowered 5.8 mm below the surface of the skull. Thecannula remained in place for one minute before infusion began. A totalvolume of 1 μl of NMDA (150 nanomoles per μl) solution was infusedslowly (0.2 μl/2 min, total time of infusion was 10 min). The cannularemained in place for 5 minutes and then was slowly withdrawn (approx.0.1 mm every 12 sec). NMDA was dissolved in 0.1M sodium phosphatebuffer, pH 7.4. An equally osmolar solution of sodium chloride was usedas a control in the contralateral striatum. The burr hole was sealedwith bone wax and the scalp sutured closed.

The animals were sacrificed by decapitation seven days followingsurgery. The striatum was dissected over ice. Samples were frozen overdry ice, weighed and then storm at -60° C. until assayed for cholineacetyltransferase (CHAT) F. Fonnum, J. Neurochem., 24:407409, 1975 andglutamic acid decarboxylase (GAD) (S. H. Wilson et al., J. Biol. Chem.,247:3159-3169, 1972) activities within 1 to 15 days.

The experimental compounds were dissolved in 0.9% NaCl or appropriatevehicle and administered i.p. either pre- and/or post-excitotoxininfusion. Percent control values (TABLE 1) reflect enzyme activity onthe left (lesioned side) compared to the contralateral control side ofeach animal. Analysis of variance was calculated by the Newman-Keulstest with the PHARM/PCS computer program (Tallarida, R. J. and Murray,R. B., Manual of Pharmacologic Calculations with Computer Programs,Springer-Verlag, New York, 1987).

                  TABLE 1                                                         ______________________________________                                        Protection Against NMDA-induced Striatal Lesion                                          Dose   Pre-      % Control                                                    (mg/kg,                                                                              treatment Enzyme Activity                                   Treatment    ip)      Time (min)                                                                              ChAT   GAD                                    ______________________________________                                        [N-(1H-indol-1-                                                                            100      30        68     63                                     yl)-2-amino]acetamide                                                         HCl          --       60        35     42                                     Vehicle                                                                       dizocilpine (ref.)                                                                          10      60        104    110                                    ______________________________________                                    

Effective quantities of the compounds of the invention may beadministered to a patient by any of the various methods, for example,orally as in capsule or tablets, parenterally in the form of sterilesolutions or suspensions, and in some cases intravenously in the form ofsterile solutions. The free base final products, while effectivethemselves, may be formulated and administered in the form of theirpharmaceutically acceptable acid addition salts for purposes ofstability, convenience of crystallization, increased solubility and thelike.

Acids useful for preparing the pharmaceutically acceptable acid additionsalts of the invention include inorganic acids such as hydrochloric,hydrobromic, sulfuric, nitric, phosphoric and perchloric acids, as wellas organic acids such as tartaric, citric, acetic, succinic, maleic,fumaric and oxalic acids.

The active compounds of the present invention may be orallyadministered, for example, with an inert diluent or with an ediblecarder, or they may be enclosed in gelatin capsules, or they may becompressed into tablets. For the purpose of oral therapeuticadministration, the active compounds of the invention may beincorporated with excipients and used in the form of tablets, troches,capsules, elixirs, suspensions, syrups, wafers, chewing gum and thelike. These preparations should contain at least 0.5% of activecompounds, but may be varied depending upon the particular form and mayconveniently be between 5% to about 70% of the weight of the unit. Theamount of active compound in such compositions is such that a suitabledosage will be obtained. Preferred compositions and preparationsaccording to the present invention are prepared so that an oral dosageunit form contains between 1.0-300 milligrams of active compound.

The tablets, pills, capsules, troches and the like may also contain thefollowing ingredients: a binder such as micro-crystalline cellulose, gumtragacanth or gelatin; an excipient such as starch or lactose, adisintegrating agent such as alginic acid, Primogel, cornstarch and thelike; a lubricant such as magnesium stearate or Sterotex; a glidant suchas colloidal silicon dioxide; and a sweeting agent such as sucrose orsaccharin may be added or a flavoring agent such as peppermint, methylsalicylate, or orange flavoring. When the dosage unit form is a capsule,it may contain, in addition to materials of the above type, a liquidcarder such as a fatty oil. Other dosage unit forms may contain othervarious materials which modify the physical form of the dosage unit, forexample, as coatings. Thus, tablets or pills may be coated with sugar,shellac, or other enteric coating agents. A syrup may contain, inaddition to the active compounds, sucrose as a sweetening agent andcertain preservatives, dyes, colorings and flavors. Materials used inpreparing these various compositions should be pharmaceutically pure andnon-toxic in the amounts used.

For the purpose of parenteral therapeutic administration, the activecompounds of the invention may be incorporated into a solution orsuspension. These preparations should contain at least 0.1% of activecompound, but may be varied between 0.5 and about 30% of the weightthereof. The amount of active compound in such compositions is such thata suitable dosage will be obtained. Preferred compositions andpreparations according to the present inventions are prepared so that aparenteral dosage unit contains between 0.5 to 100 milligrams of activecompound.

The solutions or suspensions may also include the following components:a sterile diluent such as water for injection, saline solution, fixedoils, polyethylene glycols, glycerine, propylene glycol or othersynthetic solvents; antibacterial agents such as benzyl alcohol ormethyl parabens; antioxidants such as ascorbic acid or sodium bisulfite;chelating agents such as ethylenediaminetetraacetic acid; buffers suchas acetates; citrates or phosphates and agents for the adjustment oftonicity such as sodium chloride or dextrose. The parenteral multipledose vials may be of glass or plastic.

The following examples will further illustrate this invention but arenot intended to limit it in anyway. In Table II, typicalN-(1H-indol-1-yl)-2-aminoacetamides of the present invention are listed.In Tables III-V, typical intermediates useful in the preparation of thecompounds of Table II are listed. Following the Tables, specificillustrative preparations of compounds of the invention are described.

                                      TABLE II                                    __________________________________________________________________________     ##STR12##                                                                    Ex.                                                                              R.sup.1                                                                             R.sup.2                                                                            R.sup.6    X      Y  salt                                                                             mp °C.                           __________________________________________________________________________     1b                                                                              H     H    H          H      H  HCl                                                                              260-262d                                 2b                                                                              H     CH.sub.2 OH                                                                        H          H      H  HCl                                                                              216-220                                  3b                                                                              CH.sub.2 CO.sub.2 H                                                                 H    H          H      H  -- 212-216d                                 4b                                                                              H     H    H          H      CH.sub.3                                                                         HCl                                                                              260-270d                                 5b                                                                              CH.sub.3                                                                            H    H          H      H  HCl                                                                              253-258                                  6c                                                                              H     H    Cl         H      CH.sub.3                                                                         HCl                                                                              248-249                                  7c                                                                              H     H    H          5-OCH.sub.3                                                                          H  HCl                                                                              229-235                                  8c                                                                              H     H    H          5-OCH.sub.2 C.sub.6 H.sub.5                                                          H  HCl                                                                              146-150d                                 9d                                                                              H     H    (CO)CH.sub.3                                                                             H      CH.sub.3                                                                         HCl                                                                              134-165                                 10f                                                                              H     H    (CO)C.sub.6 H.sub.4 2F                                                                   H      CH.sub.3                                                                         HCl                                                                              150-170                                 11d                                                                              H     H    (CO)C.sub.6 H.sub.4 4F                                                                   H      CH.sub.3                                                                         HCl                                                                              160-170                                 12d                                                                              H     H    (CO)C.sub.6 H.sub.4 2CF.sub.3                                                            H      CH.sub.3                                      14c                                                                              H     H    H          H      Cl                                            21 H     H    H          5-OH   H     188-190                                 22c                                                                              H     H    H          5-Cl   H     130-132                                 __________________________________________________________________________

                                      TABLE III                                   __________________________________________________________________________     ##STR13##                                                                    Ex.                                                                              R.sup.1  R.sup.6    R.sup.9        X      Y  mp °C.                 __________________________________________________________________________     1a                                                                              H        H          CH.sub.2 NHCO.sub.2 CH.sub.2 C.sub.6 H.sub.5                                                 H      H  144-148                        2a                                                                              H        H          CH(CH.sub.2 OH)NHCO.sub.2 CH.sub.2 C.sub.6                                                   H.sub.5                                                                              H  124-127                        3a                                                                              CH.sub.2 CO.sub.2 CH.sub.2 C.sub.6 H.sub.5                                             H          CH.sub.2 NHCO.sub.2 CH.sub.2 C.sub.6 H.sub.5                                                 H      H  oil                            4a                                                                              H        H          CH.sub.2 NHCO.sub.2 CH.sub.2 C.sub.6 H.sub.5                                                 H      CH.sub.3                                                                         118-120                        5a                                                                              CH.sub.3 H          CH.sub.2 NHCO.sub.2 CH.sub.2 C.sub.6 H.sub.5                                                 H      H  84-88                          6a                                                                              H        H          CH.sub.2 NHCO.sub.2 C(CH.sub.3).sub.3                                                        H      CH.sub.3                                                                         142-145                        6b                                                                              H        Cl         CH.sub.2 NHCO.sub.2 C(CH.sub.3).sub.3                                                        H      CH.sub.3                                                                         154-156                        7b                                                                              H        H          CH.sub.2 NHCO.sub.2 CH.sub.2 C.sub.6 H.sub.5                                                 5-OCH.sub.3                                                                          H  138-141                        8b                                                                              H        H          CH.sub.2 NHCO.sub.2 CH.sub.2 C.sub.6 H.sub.6                                                 5-OCH.sub.2 C.sub.6 H.sub.5                                                          H  159-161                        9c                                                                              H        (CO)CH.sub.3                                                                             CH.sub.2 NHCO.sub.2 CH.sub.2 C.sub.6 H.sub.5                                                 H      CH.sub.3                                                                         153-155                       10a                                                                              H        H          C.sub.6 H.sub.4 -2-COOH                                                                      H      CH.sub.3                                                                         191-193                       10e                                                                              H        (CO)C.sub.6 H.sub.4 2F                                                                   CH.sub.2 NHCO.sub.2 CH.sub.2 C.sub.6 H.sub.5                                                 H      CH.sub.3                                                                         226-228                       11c                                                                              H        (CO)C.sub.6 H.sub.4 4F                                                                   CH.sub.2 NHCO.sub.2 CH.sub.2 C.sub.6 H.sub.5                                                 H      CH.sub.3                         12c                                                                              H        (CO)C.sub.6 H.sub.4 2CF.sub.3                                                            CH.sub.2 NHCO.sub.2 CH.sub.2 C.sub.6 H.sub.5                                                 H      CH.sub.3                         13a                                                                              H        Br         CH.sub.2 NHCO.sub.2 CH.sub.2 C.sub.6 H.sub.5                                                 H      CH.sub.3                                                                         148-150                       14b                                                                              H        H          CH.sub.2 NHCO.sub.2 C(CH.sub.3).sub.3                                                        H      Cl 156-158                       15 H        H          CH.sub.2 NHCO.sub.2 C(CH.sub.3).sub.3                                                        H      H  140-143                       16 H        Cl         CH.sub.2 NHCO.sub.2 CH.sub.2 C.sub.6 H.sub.5                                                 H      CH.sub.3                                                                         150-152                       17 H        H          CH.sub.2 NHCO.sub.2 C(CH.sub.3).sub.3                                                        5-OCH.sub.2 C.sub.6 H.sub.5                                                          H  115-119                       18a                                                                              H        H          C(CH.sub.3).sub.3                                                                            H      CH.sub.3                                                                         179-181                       18b                                                                              H        CH(OH)C.sub.6 H.sub.4 2F                                                                 C(CH.sub.3).sub.3                                                                            H      CH.sub.3                                                                         152-155                       19 H        H          OC(CH.sub.3).sub.3                                                                           H      H  112-116                       20 H        H          C.sub.6 H.sub.4 -2-CO.sub.2 H                                                                H      H  185-190                       22b                                                                              H        H          CH.sub.2 NHCO.sub.2 C(CH.sub.3).sub.3                                                        5-Cl   H  151-154                       23 H        (CO)CH.sub.3                                                                             CH.sub.2 NHCO.sub.2 C(CH.sub.3).sub.3                                                        H      CH.sub.3                                                                         165-168                       24 H        H          CH.sub.2 N(CH.sub.3)CO.sub.2 C(CH.sub.3).sub.3                                               H      H  104-106                       25 H        H          (CH.sub.2 O.sub.2 NHCO.sub.2 C(CH.sub.3).sub.3                                               H      H  138-140                       __________________________________________________________________________

                  TABLE IV                                                        ______________________________________                                         ##STR14##                                                                    Ex.        R.sup.6        mp °C.                                       ______________________________________                                         9a        (CO)CH.sub.3   261-262                                             10b        H              186-187                                             10c        (CO)C.sub.6 H.sub.4 2F                                                                       197-199                                             11a        (CO)C.sub.6 H.sub.4 4F                                                                       227-228                                             12a        (CO)C.sub.6 H.sub.4 2CF.sub.3                                                                203-205                                             ______________________________________                                    

                  TABLE V                                                         ______________________________________                                         ##STR15##                                                                    Ex.   R.sup.6        X          Y    mp °C.                            ______________________________________                                         7a   H              5-OCH.sub.3                                                                              H    115-117                                   8a   H              5-OCH.sub.2 C.sub.6 H.sub.5                                                              H                                              9b   (CO)CH.sub.3   H          CH.sub.3                                                                           94-98                                    10d   (CO)C.sub.6 H.sub.4 2F                                                                       H          CH.sub.3                                      11b   (CO)C.sub.6 H.sub.4 4F                                                                       H          CH.sub.3                                      12b   (CO)C.sub.6 H.sub.4 2CF.sub.3                                                                H          CH.sub.3                                      14a   H              H          Cl                                            22a   H              5-Cl       H                                             ______________________________________                                    

EXPERIMENTAL EXAMPLE 1

[N-(1H-Indol-1-yl)-2-amino]acetamide hydrochloride

a. [N-(1H-Indol-1-yl)-2-(carbamic acid, phenylmethyl ester)]acetamide

To a stirred suspension of 6.31 g of N-aminoindole, 120 ml of drydichloromethane (DCM hereinafter) and 10.0 g of carbobenzyloxyglycine(CBZ glycine) was added 9.84 g of 1,3-dicyclohexylcarbodiimide (DCC).The mixture was stirred for 6 hours at room temperature. The suspensionwas filtered and the filtrate concentrated to a dark brown oil which wasdissolved in DCM and flash chromatographed on silica gel, eluting with60% DCM/hexane, DCM, 10% ethyl acetate/DCM and 15% ethyl acetate/DCM toprovide 3.03 g of a tan solid. Recrystallization from ethyl acetateprovided 2.06 g of analytically pure material, m.p. 140°-144° C.Concentration of the mother liquor afforded a solid which was trituratedwith hot ethyl acetate, filtered hot, allowed to cool to roomtemperature and filtered again. The resulting solution was treated with1 g of activated carbon, concentrated from approximately 300 ml toapproximately 200 ml, heated on a steam bath to dissolve any residualsolid and allowed to stand overnight. Filtration provided an additional4.18 g of the product, m.p. 140°-144° C., for a combined yield of 6.24g.

Analysis: Calculated for C₁₈ H₁₇ N₃ O₃ : 66.86% C, 5.30% H, 13.00% N,Found: 66.66% C, 5.08% H, 12.88% N.

b. [N-(1H-Indol-1-yl)-2-amino]acetamide hydrochloride

A suspension of 3.92 g of N-(1H-indol-1-yl)-2-(carbamic acid,phenylmethyl ester)acetamide, 0.8 g of 5% palladium on carbon and 200 mlof methanol was stirred under 1 atm of hydrogen for 12 minutes. Themixture was filtered and concentrated to an oil, which was dissolved inethyl acetate and again filtered. To the filtrate at 0°-5° C. undernitrogen was added dropwise a solution of ethereal hydrogen chlorideuntil precipitation was complete. The resulting suspension was allowedto warm to room temperature, filtered, washed with ethyl acetate anddried to provide 2.22 g of the product, m.p. 260°-262° C. (dec.).

Analysis: Calculated for C₁₀ H₁₂ ClN₃ O: 53.22% C, 5.36% H, 18.62% N,Found: 53.10% C, 5.35% H, 18.34% N.

Alternatively N-(1H-indol-1-yl)-2-(amino)acetamide is prepared from thecompound of Example 15 following substantially the procedure describedin Example 6c.

EXAMPLE 2

[N-(1H-Indol-1-yl)-2-amino-2-(hydroxymethyl)]acetamide hydrochloride

a. [N-(1H-Indol-1-yl)-2-(carbamic acid, phenylmethylester)-2-(hydroxymethyl)]acetamide

To a mixture of 83.5 of N-aminoindole, 20 g of D,L-carbobenzyloxyserineand 17.2 g of DCC was added 100 ml of dry tetrahydrofuran (THF). Themixture was stirred at room temperature for 8 hours and allowed to standat 0°-5° C. overnight. The mixture was dissolved/suspended inchloroform, flash chromatographed on silica gel, eluting with chloroformfollowed by 20% ethyl acetate/chloroform to provide 7.8 g ofN-[1H-indol-1-yl]-2-(carbamic acid, phenylmethylester)-2-(hydroxymethyl)acetamide. Recrystallization fromchloroform/ethyl acetate provided a powder, m.p. 124°-127° C.

Analysis: Calculated for C₁₉ H₁₉ N₃ O₄ : 64.58% C, 5.42% H, 11.89% N,Found: 64.71% C, 5.42% H, 11.95% N.

b. [N-(1H-Indol-1-yl)-2-amino-2-(hydroxymethyl)]acetamide hydrochloride

A suspension of 1.0 g of 5% palladium on carbon, 250 ml of methanol and4.7 g of Example 2a was stirred under 1 atmosphere of hydrogen for onehour. The suspension was filtered and the filtrate poured into a secondreaction flask containing 1 g of 5% palladium on carbon. This suspensionwas stirred under a hydrogen atmosphere for one hour, filtered andconcentrated in vacuo to an oil, which was dissolved in ethyl acetateand filtered to remove some insoluble material. The filtrate was cooledin an ice bath under a dry nitrogen atmosphere and ethereal hydrogenchloride (HCl) was added. The resulting precipitate was allowed tosettle and the solid triturated with ether, allowed to warm to roomtemperature and filtered. The dried solid (2.51 g) was recrystallizedfrom ethanol to yield 1.58 g ofN-(1H-indol-1-yl)-2-amino-2-(hydroxymethyl)acetamide hydrochloride, m.p.216°-220° C.

Analysis: Calculated for C₁₁ H₁₄ ClN₃ O₂ : 51.67% C, 5.52% H, 16.43% N,Found: 51.71% C, 5.56% H, 16.31% N.

EXAMPLE 3

[[N-(1H-Indol-1-yl)-2-amino]acetamide]acetic acid

a. [[N-(1H-Indol-1-yl)-2-(carbamic acid, phenylmethylester)]acetamide]acetic acid, phenylmethyl ester

A suspension of 9.3 g of Example 1a, 20 ml of acetonitrile, 10.4 g of40% KF on alumina (neutral, 100-125 mesh, dried one hour at 80° C. (2mm)) and 5.47 ml (7.93 g) of benzyl 2-bromoacetate was stirred at roomtemperature for 12 hours. To the suspension was added an additional 1 mlof benzyl 2-bromoacetate. The suspension was stirred for 12 hours,filtered and concentrated to an oil. The oil was dissolved in ethylacetate and flash chromatographed on silica gel, eluting with 30% ethylacetate/hexanes to yield 12.3 g of the desired product as an oil.

Analysis: Calculated for C₂₇ H₂₅ N₃ O₅ : 68.78% C, 5.34% H, 8.91% N,Found: 69.09% C, 5.56% H, 8.59% N.

b. [[N-(1H-Indol-1-yl)-2-amino]acetamide]acetic acid

A suspension of 8.0 g of Example 3a, 2 L of methanol and 1.5 g of 5%palladium on carbon was stirred at room temperature under 1 arm of H₂for one hour. The suspension was filtered and the filtrate concentratedto provide a white suspension (˜300 ml). The suspension was filtered andthe residue dried to provide 2.35 g of[[N-(1H-indol-1-yl)-2-amino]acetamide]acetic acid, m.p. 197°-200° C.Recrystallization from methanol/water raised the m.p. to 212°-216° C.The titrate from above was concentrated to provide an additional 0.52 gfor a total yield of 2.87 g.

Analysis: Calculated for C₁₂ H₁₃ N₃ O₃ : 58.29% C, 5.30% H, 16.99% N,Found: 57.99% C, 5.19% H, 16.75% N,

EXAMPLE 4

[N-(3-Methyl-1H-indol-1-yl)-2-amino]acetamide hydrochloride

a. [[N-(3-Methyl-1H-indol-1-yl)]-2-(carbamic acid, phenylmethylester)]acetamide

A suspension of 13.9 g of 3-methyl-N-aminoindole, 240 ml of dry DCM and20 g of DCC was stirred at room temperature overnight. The suspensionwas filtered, and the titrate concentrated and the residual oil flashchromatographed on silica gel, eluting with dichloromethane, 10% ethylacetate/dichloromethane and 20% ethyl acetate/dichloromethane, toprovide 22.9 g of product. The product was dissolved in chloroform andflash chromatographed on silica gel, eluting with chloroform and 10%ethyl acetate/chloroform to provide pureN-(3-methyl-1H-indol-1-yl)-2-(carbamic acid, phenylmethylester)acetamide, m.p. 118°-120° C.

Analysis: Calculated for C₁₉ H₁₉ N₃ O3: 67.64% C, 5.68% H, 12.45% N,Found: 67.34% C, 5.63% H, 12.36% N.

b. [N-(3-Methyl-1H-indol-1-yl)-2-amino]acetamide hydrochloride

To a suspension of 0.6 g of 5% Pd on carbon and 90 ml of methanol wasadded, under nitrogen, a solution of 3.0 g of Example 4a in 60 ml of dry:methanol. The suspension was stirred under 1 atm of hydrogen for 45minutes, filtered and the filtrate concentrated to an oil. The oil wastreated with anhydrous ether and the mixture decanted. The supernatantwas concentrated to an oil which was dissolved in ethyl acetate and theresulting solution, under nitrogen, cooled in an ice bath. To thestirred solution was added ethereal HCl until precipitation ceased andthe suspension was acidic. To the suspension was then added anhydrousether, after which it was stirred 5 minutes and allowed to warm to roomtemperature. The suspension was filtered, and the residue was washedwith ether and dried to provide 1.21 g of[N-(3-methyl-1H-indol-1-yl)-2-amino]acetamide hydrochloride, m.p.260°-270° C. (dec.).

Analysis: Calculated for C₁₁ H₁₄ ClN₃ O: 55.12% C, 5.89% H, 17.53% N,Found: 55.01% C, 5.86% H, 17.20% N.

Alternatively, [N-(3-methyl-1H-indol-1-yl)-2-amino]acetamidehydrochloride is prepared from the compound of Example 6a followingsubstantially the procedure described in Example 6c.

EXAMPLE 5

[N-(Methyl)-N-(1H-indol-1-yl)-2-amino]acetamide hydrochloride

a. [[N-(Methyl)-N-(1H-indol-1-yl)]-2-(carbamic acid, phenylmethylester)]acetamide

To a stirred suspension of 9.0 g of Example 1a in 20 ml of acetonitrilewas added 9.9 g of 40% KF on alumina (dried 4-5 hours at 75°-80° C.,2mm) after which was added 2.07 ml (4.72 g) of iodomethane. Thesuspension was stirred at room temperature for 20 hours. The reactionmixture was diluted with acetonitrile, filtered and the filtrateconcentrated to an oil. The oil was flash chromatographed on silica gel,eluting with chloroform followed by 5% ethyl acetate/chloroform,, toprovide 9.6 g of an oil which crystallized on standing for several daysto give 7.3 g of [[N-(methyl)-N-(1H-indol-1-yl)]-2-(carbamic acid,phenylmethyl ester)]acetamide, m.p. 84°-88° C.

Analysis: Calculated for C₁₉ H₁₉ N₃ O₃ : 67.64% C, 5.68% H, 12.45% N,Found: 67.71% C, 5.63% H, 12.45% N.

b. [(N-(Methyl)-N-(1H-indol-1-yl)-2-amino]acetamide hydrochloride

A solution of 4.60 g of Example 5a dissolved in 100 ml of dry methanolwas added to a suspension of 0.5 g of 5% palladium on carbon in 130 mlof dry methanol. The mixture was stirred at room temperature under 1 atmof hydrogen for 1.75 hours. The suspension was filtered and the filtrateconcentrated to an oil which was dissolved in ether and filtered. To thefiltrate was added ethereal HCl until precipitation ceased. Thesuspension was filtered and the residue washed with ether and dried atroom temperature in vacuo (2 mm Hg). The white solid (1.92 g) wasrecrystallized from 100% ethanol to provide 1.67 g of[(N-methyl)-N-(1H-indol-1-yl)-2-amino]acetamide hydrochloride, m.p.253°-258° C. (dec.).

Analysis: Calculated for C₁₁ H₁₄ ClN₃ O: 55.12% C, 5.89% H, 17.53% N,Found: 55.05% C, 5.93% H, 17.32% N.

EXAMPLE 6

[N-(2-Chloro-3-methyl-1H-indol-1-yl)-2-amino]acetamide hydrochloride

a. [[N-(3-Methyl-`H-indol-1-yl)]-2-(carbamic acid, t-butylester)]acetamide

To a stirred solution of 15 g of N-amino-3-methylindole, 18.0 g oft-butyoxycarbonylglycine and 250 ml of dry DCM was added 21.2 g of DCC.The mixture was stirred for 3.5 hours at room temperature, filtered andthe filtrate concentrated to provide an off-white solid. The materialwas purified by flash chromatography on silica gel, eluting with 10%ethyl acetate/dichloromethane followed by 15% ethylacetate/dichloromethane to provide 25.4 g of[[N-(3-methyl-1H-indol-1-yl)]-2-(carbamic acid, t-butylester)]acetamide, m.p. 142°-145° C.

Analysis: Calculated for C₁₆ H₂₁ N₃ O₃ : 63.35% C, 6.98% H, 13.85% N,Found: 63.42% C, 6.86% H, 13.59% N.

b. [[N-(2-Chloro-3-methyl-1H-indol-1-yl)]-2-(carbamic acid, t-butylester)]acetamide

To a stirred solution of 10.0 g of Example 6a, 3.96 g ofN-chlorosuccinimide and 350 ml of dry dimethylformamide (DMFhereinafter) was added 50 mg of 2,2'-azobis(2-methylpropionitrile)(AIBN). The solution was stirred for 10 minutes at room temperature and1 hour at 40° C. The solution was allowed to cool to room temperature;diluted with ethyl acetate; washed with water, brine, dried (Na₂ SO₄),filtered and concentrated to an oil. The oil was dissolved in chloroformand purified by HPLC (silica), eluting with chloroform to provide 6.34 gof [[N-(2-chloro-3-methyl-1H-indol-1-yl)]-2-(carbamic acid, t-butylester)]acetamide, m.p. 154°-156° C.

Analysis: Calculated for C₁₆ H₂₀ ClN₃ O₃ : 56.89% C, 5.97% H, 12.44% N,Found: 56.94% C, 5.86% H, 12.29% N.

c. [N-(2-Chloro-3-methyl-1H-indol-1-yl)-2-amino]acetamide hydrochloride

To a stirred solution of 3.5 g of[[N-(2-chloro-3-methyl-1H-indol-1-yl)]-2-carbamic acid, t-butylester]acetamide in 44 ml of dry ethyl acetate in an ice bath undernitrogen was added a solution of 87 ml of 1M HCl in ethyl acetate. Themixture was allowed to warm to room temperature and stirred for 18hours. The resulting suspension was filtered and the filtrate washedwith ethyl acetate and subsequently dried at 80° C. in vacuo (2 mm Hg)to provide 2.51 g of[N-(2-chloro-3-methyl-1H-indol-1-yl)-2-amino]acetamide hydrochloride,m.p. 248°-249° C. (dec.).

Analysis: Calculated for C₁₁ H₁₃ C₁₂ N₃ O: 48.19% C, 4.78% H, 15.33% N,Found: 47.88% C, 4.67% H, 15.09% N.

The compounds of Example 22b and c (Tables III & II, respectively) wereprepared from N-amino-5-chloroindole following substantially the processset forth in parts a and c in this example.

EXAMPLE 7

[N-(5-Methoxy-1H-indol-1-yl)-2-amino]acetamide

a. N-(Amino)-5-(methoxy)-1H-indole

5-Methoxyindole (15.0 g) was dissolved in anhydrous DMF (90 ml), cooledto 0° C., and milled KOH (28 g) was added. Upon completion of addition,hydroxylamine-O-sulfonic acid (14.7 g) was added portionwise over aperiod of 1 hour. The reaction temperature was maintained below 20° C.during this addition. The mixture was stirred at 0° C. for 1 hour andthen poured into 200 ml of water (H₂ O). The product was extracted intodichloromethane and washed with brine (2×100 ml). The organic phase wasdried (Na₂ SO₄), filtered and concentrated to a deep red oil. Thismaterial was purified using preparative HPLC (silica), eluting with 30%hexane in ethyl acetate to yield a solid, m.p. 115°-117° C.

Analysis: Calculated for C₉ H₁₀ N₂ O: 66.65% C, 6.21% H, 17.27% N,Found: 66.37% C, 6.18% H, 17.14% N,

N-amino-5-chloroindole was prepared from 5-chloroindole followingsubstantially the process set forth in this example.

b. [N-(5-Methoxy-1H-indol-1-yl)-2-(carbamic acid, phenylmethylester)]acetamide

N-Carbobenzyloxyglycine (4.80 g) was dissolved in anhydrous dioxane (80ml) and treated with 1-hydroxybenzotriazole (3.10 g) at room temperatureunder N₂. The mixture was cooled to 0° C. and treated with solid1-amino-5-methoxy-1H-indole (3.71 g) followed by DCC (4.7 g). Themixture was allowed to slowly warm to room temperature and stirred for48 hours. The solvent was removed in vacuo and the residue wastriturated with dichloromethane. The insoluble material was collected byfiltration and recrystallized from ethanol. The filtrate from the crudereaction mixture was diluted with dichloromethane (100 ml), washed withbrine (1×100 ml), saturated NaHCO₃ (1×100 ml), brine (1×50 ml) and dried(Na₂ SO₄). Upon filtration and evaporation of the solvent, the residuewas chromatographed on silica gel. The powder was applied to silica gelto yield N-(5-methoxy)-1H-indol-1-yl)-2-(carbamic acid, phenylmethylester)acetamide, m.p. 138°-141° C.

Analysis: Calculated for C₁₉ H₁₉ N₃ O₄ : 64.58% C, 5.42% H, 11.89% N,Found: 64.66% C, 5.54% H, 11.76% N.

c. [N-(5-Methoxy-1H-indol-1-yl)-2-amino]acetamide

[N-(5-Methoxy-1H-indol-1-yl)-2-amino]acetamide is prepared from Example7b following substantially the procedure set forth in Example 1 b.

EXAMPLE 8

[N-(5-Phenylmethoxy-1H-indol-1-yl)-2-amino]acetamide

a. N -Amino-5-phenylmethoxy-1H-indole

N-Amino-5-phenylmethoxy-1H-indole was prepared from5-phenylmethoxyindole using substantially the procedure described inExample 7a.

b. [N-(5-Phenylmethoxy-1H-indol-1-yl)-2-(carbamic acid, phenylmethylester)]acetamide

N-Carbobenzyloxyglycine (1.93 g) was dissolved in dry dioxane (23 ml)and treated with 1-hydroxybenzotriazole (1.24 g). The mixture was thencooled to 0° C. and DCC (1.73 g) and N-amino-5-phenylmethoxy-1H-indole(2.0 g) were added sequentially. The solution was stirred at roomtemperature under N₂ for 48 hours. The dioxane was removed under reducedpressure and the solid residue was dissolved in DCM. The insolublematerial was removed by filtration and recrystallized from ethanol toyield a small amount of the product. The filtrate was purified usingpreparative HPLC (silica), eluting with heptane/EtOAc (1:1), to yield asolid which was recrystallized from ethanol, m.p. 159°-161° C.

Analysis: Calculated for C₂₅ H₂₃ N₃ O₄ : 69.92% C, 5.40% H, 9.78% N,Found: 69.93% C, 5.31% H, 9.80% N.

c. [N-(5-Phenylmethoxy-1H-indol-1-yl)-2-amino]acetamide

The compound of Example 8b was dissolved in 75 ml of methanol. Thesolution at room temperature was added to 0.1 g of 10% Pd on C. Thesuspension was stirred under 1 atm of hydrogen for 1/2 hour. Thesuspension was filtered and concentrated to an oil. The oil was treatedwith ethyl acetate after which a solid was obtained. The solid wasremoved by filtration and dried. The filtrate was concentrated toprovide an oil which was dissolved in 10% methanol/CHCl₃ and allowed tostand for 2 hours. A crystalline solid was isolated by filtration. Thefiltrate was purified by flash chromatography on silica gel, elutingwith 10% methanol/chloroform followed by 20% methanol/chloroform toyield an oil which was dissolved in ethyl acetate/ether and thehydrochloride salt precipitated by addition of ethereal hydrogenchloride. The white solid was isolated by filtration, dried andrecrystallized from ethanol to provide analytically pure material, m.p.146-150 d.

Analysis: Calculated for: C₁₇ H₁₈ ClN₃ O₂ : 61.54% C, 5.47% H, 12.66% N,Found: 61.65% C, 5.28% H, 12.61% N,

EXAMPLE 9

[N-(2-Acetal-3-methyl-1H-indol-1-yl)-2-amino]acetamide

a. 2-(2-Acetyl-3-methyl-1H-indol-1-yl)-1H-isoindole-1,3-(2H)dione

2-(2- acetyl-3-methyl-1H-indol-1-yl)-1H-isoindole-1,3-(2H)dione wasprepared from Compound 10b and acetyl chloride following substantiallythe procedure described in Example 10c.

b. 2-Acetyl-1-amino-3-methyl-1H-indole

To the 10.5 g of2-(2-acetyl-3-methyl-1H-indol-1-yl)-1H-isoindole-1,3-(2H)dione undernitrogen was added 52.0 ml of degassed dimethylformamide followed by52.0 ml of degassed 40% aqueous methylamine. The solution was stirred atroom temperature under nitrogen for 2 hours, poured onto ice/water/ethylacetate, extracted three times with ethyl acetate, washed with water,brine, dried over sodium sulfate, filtered and concentrated to an oilweighing 6.93 g. Chromatographic purification, eluting with chloroformgave 5.60 g of a solid. Recrystallization using isopropyl alcohol, gave2.50 g of 2-acetyl-1-amino-3-methyl-1H-indole, m.p. 94°-98° C.

Analysis: Calculated for C₁₁ H₁₂ N₂ O: 70.19% C, 6.43% H, 14.88% N,Found: 69.82% C, 6.34% H, 14.68% N.

c. [N-(2-Acetyl)-3-methyl-(1H-indol-1-yl)]-2-(carbamic acid,phenylmethyl ester)]acetamide

[N-(2-Acetyl)-3-methyl-(1H-indol-1-yl)]-2-(carbamic acid, phenylmethylester)]acetamide was prepared from the compound of Example 9b usingsubstantially the process described in Example 1a to yield the desiredproduct, m.p. 153°-155° C.

Analysis: Calculated for: 66.48% C, 5,58% H, 11.07% N, Found: 66.26% C,5.73% H, 10.85% N.

d. [N-(2-Acetyl-3-methyl-1H-indol-1-yl)-2-amino]acetamide

[N-(2-Acetyl-3-methyl-1H-indol-1-yl)-2-amino]acetamide is prepared fromExample 9c using substantially the process described in Example 1 b.

EXAMPLE 10

[N-[2-(2-Fluorobenzoyl)-3-methyl-1H-indol-1-yl]-2-amino]acetamide

a. 2-[[(3-Methyl-1H-indol-1-yl)amino]carbonyl]benzoic acid

A suspension of 2.0 g of N-amino-3-methylindole, 140 ml of drychloroform and 2.74 g of phthalic anhydride was stirred at reflux for 4hours. The suspension was allowed to cool to room temperature,concentrated to approximately 50 ml, filtered and the residue washedwith chloroform to provide 4.25 g of a white solid. Recrystallizationfrom ethyl acetate provided 3.18 g (79.0%) of2-[[(3-methyl(indol-1-yl)amino]carbonyl]benzoic acid, m.p. 191°-193° C.

The compound of Example 20 (Table III) is prepared from N-aminoindolefollowing substantially the same process.

b. 2-[3-Methyl-1H-indol-1-yl]-1H-isoindole-1,3-(2H)dione

A suspension of 14.0 g of Example 14a, 10.7 g of DCC, 140 ml of dryCHCl₃ and 560 mg of dimethylaminopyridine was stirred at roomtemperature under nitrogen for 14 hours. The suspension was filtered,the filter cake washed with a small volume of chloroform, the filtrateconcentrated to about 50 ml and flash chromatographed on silica gel,eluting with dichloromethane to provide 11.6 g of2-[3-(methyl-1H-indol-1-yl]1H-isoindole-1,3-(2H)dione, m.p. 186°-187° C.

Analysis: Calculated for C₁₇ H₁₄ N₂ O₃ : 73.90% C, 4.38% H, 10.14% N,Found: 73.83% C, 4.33% H, 10.07% N.

c.2-[2-(2-Fluorobenzoyl)-3-methyl-1H-indol-1-yl]-1H-isoindole-1,3-(2H)dione

A solution of 0.91 ml of 2-fluorobenzoyl chloride in 50 ml of dry DCMwas cooled in an ice/salt bath. To the solution was added 0.86 ml (1.9It g) of tin (IV) chloride. The mixture was stirred at -5° to 0° C. for10 minutes after which was added 2.0 g of2-(3-methyl-1H-indol-1-yl)-1H-isoindole-1,3-(2H)dione. The reactionmixture was stirred at 0° C. for 1 hour, allowed to warm to roomtemperature, cooled again in an ice bath, poured onto ice, extractedtwice with ethyl acetate, washed with water, brine, dried (Na₂ SO₄),filtered and concentrated to a green-yellow solid (2.67 g). The solidwas chromatographed on silica gel, eluting with 15% acetone/heptane toprovide 1.99 g of a solid, which was recrystallized from ethanol, m.p.197°-199° C.

Analysis: Calculated for C₂₄ H₁₅ FN₂ O₃ : 72.36% C, 3.80% H, 7.03% N,Found: 72.03% C, 3.92% H, 7.01% N.

d. N -Amino-2-(2-fluorobenzoyl)-3-methyl-1H-indole

To 10.2 g of Example 10c under nitrogen was added 50 ml of degassed DMF,followed by 50 ml of degassed 40% aqueous methylamine. The solution wasstirred at room temperature under nitrogen for 3 hours, poured ontoice/water/ethyl acetate, extracted 3× with ethyl acetate, washed withwater, brine, dried, filtered and concentrated to yield a brown solid.The solid material was dissolved in a minimum volume of ethyl acetateand purified by HPLC (silica) to provide 5.82 g of a brown solid.

e. [N-[2-(2-Fluorobenzoyl)-3-methyl-1H-indol-1-yl]-2-(carbamic acid,phenylmethyl ester)]acetamide

A suspension of 1.00 g of Example 10d, 15 ml of dry DCM, 0.78 g of CBZglycine and 0.78 g of DCC was stirred at room temperature under nitrogenfor 6 hours. The suspension was filtered, the filter cake washed withdry DCM, and the combined filtrate concentrated to an oil. The oil wasdissolved in ethyl acetate and purified by flash chromatography onsilica gel, eluting with ethyl acetate/heptane (10%, 15%, 20% and 25%,respectively) to provide 0.84 g of a yellow oil which crystallized onstanding, m.p. 226°-228° C.

Analysis: Calculated for C₂₆ H₂₂ FN₈ O₄ : 67.97% C, 4.83% H, 9.15% N,Found: 68.00% C, 4.90% H, 9.07% N.

f. [N-[2-(2-Fluorobenzoyl)-3-methyl-1H-indol-1-yl]-2-amino]acetamide

A suspension of 5.0 g of Example 10e, 620 ml of dry methanol and 1.0 gof 10% Pd/C was stirred under 1 arm of hydrogen for 5 hours. Thesuspension was filtered and the filtrate was concentrated to an oil. Theoil was dissolved in 5% methanol/dichloromethane and flashchromatographed on silica gel, eluting with the same solvent mixture toyield an oil. The oil was dissolved in a minimum volume of ethylacetate, diluted with ether and the hydrochloride precipitated byaddition of ethereal HCl to provide 2.14 g of a yellow solid, m.p.150°-170° C.

Analysis: Calculated for C₁₈ H₁₆ FN₃ O₂ ·HCl: 59.76% C, 4.74% H, 11.61%N, Found: 59.60% C, 4.77% H, 11.51% N,

EXAMPLE 11

[N-[2-(4-Fluorobenzoyl)-3-methyl-1H-indol-1-yl]amino]acetamidehydrochloride

a.2-[2-(4-Fluorobenzoyl)-3-methyl-1H-indol-1-yl]-1H-isoindole-1,3-(2H)dione

A solution of 8.14 ml of 4-fluorobenzoyl chloride and 450 ml of dry DCMwas cooled in an ice/salt bath to 0° C. To the stirred solution wasadded 7.74 ml of tin (IV) chloride. The mixture was stirred at -5° C. to0° C. for 10 minutes after which was added 18.0 g of2-[(3-methyl-1H-indol-1-yl]-1H-isoindole-1,3-(2H)dione (Example 10b).The reaction mixture was stirred at 0° C. for 1.5 hours, allowed to warmto room temperature for 2 hours, cooled again in an ice bath, pouredonto ice, extracted twice with ethyl acetate, washed with water, brine,dried over sodium sulfate, filtered and concentrated to a yellow solid.Chromatography (15% acetone/heptane) provided a solid weighing 56.8 g.Recrystallization from ethyl alcohol gave 21.1 g of the product, m.p.227°-228° C.

Analysis: Calculated for: C₂₄ H₁₅ FN₂ O₃ : 72.36% C, 3.80% H, 7.03% N,Found: 72.45% C, 3.82% H, 6.93% N.

b. N-Amino-2-(4-fluorobenzoyl)-3-methyl-1H-indole

N-amino-2-(4-fluorobenzoyl)-3-methyl-1H-indole was prepared fromCompound 11 a using substantially the procedure described in Example10d.

c. [N-[2-(4-Fluorobenzoyl)-3-methyl-1H-indol-1-yl]-2-(carbamic acid,phenylmethyl ester)]acetamide

[N-[2-(4-Fluoro)benzoyl]-3-methyl-1H-indol-1-yl]-2-carbamic acidphenylmethyl ester acetamide was prepared from the Compound 11b usingsubstantially the procedure described in Example 10e.

d. [N-[2-(4-Fluorobenzoyl)-3-methyl-1H-indol-1-yl)]-2-amino]acetamide

A suspension of 5.41 g of[N-[2-(4-fluorobenzoyl)-3-methyl-1H-indol-1-yl)]-2-(carbamic acid,phenylmethyl ester)]acetamide, 670 ml of dry methanol and 1.08 g of 10%Pd on carbon was stirred under 1 atm of hydrogen for 45 minutes. Thesuspension was filtered and the filtrate concentrated :to a solidweighing 3.71 g. The solid was dissolved in minimal volume of DCM, andchromatographed on silica, eluting with chloroform and 5%methanol:chloroform. Fractions containing the product were concentratedto give 2.48 g of a solid. The solid was dissolved in minimal volume ofethyl acetate, diluted with ethyl ether and ethereal hydrogen chloridewas added. The resulting solid was collected and dried for 2 hours toyield 2.06 g of the product, m.p. 160°-170° C.

EXAMPLE 12

[N-[2-[2-(Trifluoromethyl)benzoyl]-3-methyl-1H-indol-1-yl]-2-amino]acetamid

a. 2-[2-[2-(Trifluoromethyl)benzoyl]-3-methyl-1H-indol-1-yl]-1H-isoindole-1,3-(2H)dione

To a stirred solution of 1.59 g of 2-(trifluoromethyl)benzoyl chloridein 50 ml of dry DCM at 5° C. was added 0.86 ml (1.92 g) of tin IVchloride. The solution was stirred at -5° C. for 10 minutes. To thesolution was added 2.0 g of2-[(3-methyl-1H-indol-1-yl]-1H-isoindole-1,3-(2H)dione. The solution wasstirred for 2 hours at 5° C. and poured onto ice/water/ethyl acetate.The mixture was extracted with ethyl acetate, washed with water, brine,dried, filtered and concentrated to a white solid. The material waspurified by HPLC (silica), eluting with 10% acetone/heptane, 15%acetone/heptane and ethyl acetate to provide 2.27 g of2-[2-(2-trifluoromethyl)benzoyl-3-methyl-1H-indol-1-yl]-1H-isoindole-1,3-(2H)dione,m.p. 202°-205° C.

b. N-Amino-2-[2-(trifluoromethyl)benzoyl]-3-methyl-1H-indole

N-Amino-2-(2-(trifluoromethyl)benzoyl)-3-methyl-1H-indole is preparedfrom Example 12a using substantially the procedure described in 10d.

c.[N-[2-[2-(Trifluoromethyl)benzoyl]-3-methyl-1H-indol-1-yl]-2-(carbamicacid, phenylmethyl ester)]acetamide

[N-[2-[2-(Trifluoromethyl)benzoyl]-3-methyl-1H-indol-1-yl]-2-(carbamicacid phenylmethyl ester)]acetamide is prepared from Example 12b usingsubstantially the procedure described in Example 10e.

d.[N-12-12-(Trifluoromethyl)benzoyl]-3-methyl-1H-indol-1-yl-2-amino]acetamide

[N-[2-[2-(Trifluoromethyl)benzoyl]-3-methyl-1H-indol-1-yl]-2-amino]acetamideis prepared from Example 12c using substantially the procedure describedin Example 10f.

EXAMPLE 13

[[N-(2-Bromo-3-methyl-1H-indol-1-yl)]-2-(carbamic acid, phenylmethylester)]acetamide

To 3 g of [[N-(3-methyl-1H-indol-1-yl)]-2-(carbamic acid, phenylmethylester)]acetamide Example 4a and 1.59 g of N-bromosuccinamide was added75 ml of dry DMF. The mixture was stirred at room temperature for 10minutes and at 40° C. for 3 hours. The solution was allowed to cool toroom temperature, diluted with ethyl acetate, poured onto ice, washedtwice with water, once with brine, dried (Na₂ SO₄), filtered andconcentrated to an oil. The material was dissolved in chloroform andflash chromatographed on silica gel, eluting with chloroform followed by1% ethyl acetate/chloroform to provide 2.29 g of[[N-(2-bromo-3-methyl-1H-indol-1-yl)]-2-(carbamic acid, phenylmethylester)]acetamide, m.p. 148°-150° C.

Analysis: Calculated for C₁₉ H₁₈ BrN₃ O₃ : 54.82% C, 4.36% H, 10.09% N,Found: 55.21% C, 4.36% H, 10.02% N.

EXAMPLE 14

[N-(3-Chloro)-1H-indol-1-yl)-2-amino]acetamide

a. N-Amino-3-chloro-1H-indole

To a stirred solution of 12.6 g of 3-chloroindole in 125 ml of dry DMFat 0° C. was added 0.5 g of milled K₂ CO₃ in 20 ml of dry DMF, followedby 30 g of KOH in 20 ml of dry DMF. The mixture was cooled to about 0°C. after which was added 13.3 g of NH₂ OSO₃ H such that the temperaturedid not rise above 0° C. When addition was complete, a second charge of2.22 g of NH₂ OSO₃ H was added. When addition was complete a third 2.22g charge of NH₂ OSO₃ H was added. The mixture was poured intoice/water/toluene, extracted into toluene, washed with water andconcentrated to provide 5.6 g of an oil which crystallized on standingovernight.

b. [[N-(3-Chloro-1H-indol-1-yl)]-2-(carbamic acid, t-butylester)]acetamide

To a stirred mixture of 2.0 g of 3-chloro-N-aminoindole, 2..14 g oft-BOC glycine and 30 ml of dry DCM was added 2.52 g of DCC. The mixturewas stirred at room temperature, under nitrogen, for 18 hours. Thesuspension was filtered and the filtrate concentrated to an oil whichwas purified by HPLC on silica gel, eluting with DCM followed by 5% and10% ethyl acetate/DCM, respectively to provide 1.01 g of product. Theproduct was stirred in warm CHCl₃, allowed to cool to room temperature,filtered and purified by HPLC on silica to provide an additional 0.58 gof product for a total yield of 1.16 g of[[N-(3-chloro-1H-indol-1-yl)]-2-(carbamic acid, t-butylester)]acetamide, m.p. 156°-158° C.

Analysis: Calculated for C₁₅ H₁₈ ClN₃ O₃ : 55.64% C, 5.60% H, 12.98% N,Found: 56.03% C, 5.68% H, 12.85% N.

c. [N-(3-Chloro-1H-indol-1-yl)-2-amino]acetamide

[N-(3-Chloro-1H-indol-1-yl)-2-amino]acetamide is prepared usingsubstantially the procedure described in Example 6c.

EXAMPLE 15

N-(1H-Indol-1-yl)-2-(carbamic acid, t-butyl ester)acetamide

To a stirred solution of 3.77 g of N-aminoindole, 5.0 g oft-butoxycarbonyl (t-BOC) glycine and 70 ml of dry DCM was added 5.89 gof DCC. The mixture was stirred for 2 hours at room temperature,filtered and concentrated to an oil which was purified by flashchromatography on silica gel, eluting with 30% ethyl acetate/hexanes.The product-containing fractions were combined, concentrated and flashedchromatographed on silica gel, eluting with 1:1 DCM/hexanes followed by60% DCM/hexanes. The product-containing fractions were combined andconcentrated to an oil which crystallized on standing to provide afterdrying at 80° C. (1 mm Hg) 4.70 g of [N-(1H-indol-1-yl)-2-(carbamicacid, t-butyl ester) ]acetamide, m.p. 134°-138° C. Recrystallizationfrom cyclohexane/ethyl acetate raised the m.p. to 140°-143° C.

Analysis: Calculated for C₁₅ H₁₉ N₃ O₃ : 62.27% C, 6.62% H, 14.52% N,Found: 61.90% C, 6.53% H, 14.32% N.

The compound of Example 23 (Table III was prepared followingsubstantially the process described in this example starting with thecompound of Example 9b.

The compounds of Examples 24 and 25 (Table III) were prepared followingsubstantially the process described in this example starting withN-aminoindole and N-(t-butoxycarbonyl)sarcosine and 3-(t-butoxycarbonylamino)propionic acid respectively and eluting DCM/ethyl acetate.

EXAMPLE 16

[[N-(2-Chloro-3-methyl-1H-indol-1-yl) ]-2-(carbamic acid, phenylmethylester)]acetamide

To a mixture of 10.0 g of Example 4a, 3.96 g of N-chlorosuccinimide and50 mg of 2,2'-azobis(2-methylpropionitrile) (AIBN) was added, undernitrogen, 250 ml of DMF. The mixture was stirred for 15 minutes at roomtemperature, heated to 40° C. and stirred at that temperature for onehour. The mixture was allowed to cool to room temperature, diluted withethyl acetate and extracted twice with ethyl acetate. The combinedorganic fractions were washed with water, brine, dried and concentratedto an oil. The oil was dissolved in chloroform and purified by flashchromatography on silica gel, eluting with chloroform followed by 2%ethyl acetate/chloroform to provide 8.02 g of product, m.p. 150f°-152°C.

Analysis: Calculated for C₁₉ H₁₈ ClN₃ O₃ : 61.38% C, 4.88% H, 11.30% N,Found: 61.32% C, 4.88% H, 11.29% N,

EXAMPLE 17

[N-(5-Phenylmethoxy-1H-indol-1-yl)-2-(carbamic acid, t-butylester)]acetamide

N-(ten-Butoxycarbonyl)glycine (0.740 g) was dissolved in anhydrous DCM(8.0 ml) and treated with 1-hydroxybenzotriazole hydrate (0.623 g) undera nitrogen atmosphere at room temperature. The resultant slurry wascooled to 0° C. and treated with DCC (0.95 g). After stirring for twentyminutes at this temperature, a solution of1-amino-5-phenylmethoxy-1H-indole (Example 8a) (1.0 g) in DCM (2.0 ml)was added via canula. The resulting mixture was allowed to graduallywarm to room temperature and stirred for 20 hours. The mixture wasextracted several times with brine, saturated NaHCO₃ (aq) and brine onceagain. The organic phase was dried (Na₂ SO₄), filtered and concentratedto a tan powder. This material was dissolved in DCM and chromatographedon silica gel (hexane/EtOAc, 1:1 ) to afford 1.0 g of the product.

Analysis: Calculated for C₂₂ H₂₅ N₃ O₄ : 66.82% C, 6.37% H, 10.63% N,Found: 66.96% C, 6.53% H, 10.62% N,

EXAMPLE 18

[2-[(2-Fluorophenyl)hydroxymethyl]-3-methyl-N-[(trimethylacetyl)amino]]-1H-indole

a. [3-Methyl-N-[(trimethylacetyl)amino]]-1H-indole

To a stirred solution of 2.0 g of 3-methyl-N-amino-1H-indole, 20 ml ofdry DCM and 1.73 g (2.38 ml) of triethylamine in an ice bath was addeddropwise a solution of 1.82 g (1.86 ml) of trimethylacetylchloride in 3ml of DCM. The mixture was stirred at 0°-5° C. for 10-15 minutes,allowed to warm to room temperature and stirred for 2 hours at roomtemperature. The mixture was again cooled in an ice bath, poured intoice/water/ethyl acetate, extracted with ethyl acetate, washed withbrine, dried (Na₂ SO₄), filtered and concentrated to an oil whichcrystallized on standing. The material was purified by flashchromatography on silica gel, eluting with 2% and 5% ethyl acetate/DCMto provide 2.50 g of [3-methyl-N-[(trimethylacetyl)amino]]-1H-indole,m.p. 179°-181° C.

Analysis: Calculated for C₁₄ H₁₈ N₂ O: 73.01% C, 7.88% H, 12.16% N,Found: 73.22% C, 7.94% 12.14% N.

b.[2-[(2-Fluorophenyl)hydroxymethyl]-3-methyl-N-[(trimethylacetyl)amino]]-1H-indole

To a stirred solution of 6.91 g of[3-methyl-N-[(trimethylacetyl)amino]]-1H-indole in 140 ml of drytetrahydrofuran (THF) at -60° to -70° C. was added 53.5 ml of 1.2M nBuLiin hexanes. The mixture was allowed to warm to 0° C. and stirred for 45minutes under nitrogen at 0° C. To the solution was added 4.73 ml (5.56g) of 2-fluorobenzaldehyde. The mixture was stirred for several minutesat 0° C., allowed to warm to room temperature and again cooled in an icebath. The mixture was poured into ice/water, extracted twice with ethylacetate, washed with water, brine, dried (Na₂ SO₄), filtered andconcentrated to an oil which crystallized on standing. The material waspurified by HPLC on silica gel to provide 10.6 g of[2-[(2-fluorophenyl)hydroxymethyl]-3-methyl-N-[(trimethylacetyl)amino]]-1H-indole,m.p. 152°-155° C.

Analysis: Calculated for C₂₁ H₂₃ FN₂ O₂ : 71.17% C, 6.54% H, 7.90% N,Found: 71.20% C, 6.60% H, 7.78% N.

EXAMPLE 19

N-(t-Butoxycarbonylamino)-1H-indole

To a stirred solution of 10.0 g of N-aminoindole in 50 ml of dry THF wasadded 18.2 g of di-t-butyl dicarbonate in 50 ml of dry THF. The mixturewas heated to 50° C. and stirred at that temperature for 16 hours undernitrogen. The solution was concentrated to an oil and purified by HPLCto provide, after crystallization from heptane/ethyl acetate, 8.20 g ofN-(t-butoxycarbonylamino)-1H-indole, m.p. 112°-116° C.

Analysis: Calculated for C₁₃ H₁₆ N₂ O₂ : 67.22% C, 6.94% H, 12.06% N,Found: 67.55% C, 6.92% H, 12.04% N.

EXAMPLE 21

[N-(5-Hydroxy-1H-indol-1-yl]-2-amino]acetamide

A solution of 5.0 g of N-(5-phenylmethoxy-1H-indol-1-yl)-2-(carbamicacid, phenylmethyl ester)acetamide (Example 8b) dissolved in 1 l ofmethanol was added to 1.0 g of 10% Pd on C. The suspension stirred for1/2 hour under atm of hydrogen. The suspension was filtered and thefiltrate concentrated to an oil. The oil was triturated with ethylacetate, filtered and dried to provide 1.76 g of[N-(5-hydroxy-1H-indol-1-yl)-2-amino]acetamide. Recrystallization fromethanol provided material having the correct analysis for the desiredcompound, m.p. 190°-193° C.

Analysis: Calculated for C₁₀ H₁₁ N₃ O₂ : 58.53% C, 5.40% H, 20.48% N,Found: 58.33% C, 5.58% H, 20.21% N.

It should be understood that this specification and examples are setforth by way of illustration and not limitation and that variousmodifications and changes may be made without departing from the spiritand scope of the present invention as defined by the appended claims.

We claim:
 1. A compound of the formula ##STR16## wherein X is hydrogen,chloro, bromo, fluoro, hydroxy, loweralkoxy, arylloweralkoxy, acyloxy,loweralkylaminocarbonyloxy, diloweralkylaminocarbonyloxy, amino,loweralkylamino, diloweralkylamino, acylamino, loweralkyl ortrifluoromethyl;Y is hydrogen, loweralkyl, chloro or bromo; Z ishydrogen, loweralkyl, loweralkoxy or halogen; or X and Z taken togethercan form a methylenedioxy group; R⁶ is hydrogen, chloro, bromo,arylcarbonyl, loweralkylcarbonyl, aryl(hydroxy)loweralkyl orhydroxyloweralkyl; and R⁹ is hydrogen, loweralkylcarbonyl,loweralkoxycarbonyl, phenylcarbonyl or carboxyphenylcarbonyl; and R¹⁰ ishydrogen; with the proviso that when X, Z and R⁶ are hydrogen and Y ishydrogen or methyl, R⁹ and R¹⁰ are not each hydrogen; and further whenY, R⁶, R⁹, R¹⁰ and Z are hydrogen, X is not chloro, bromo or methyl. 2.The compound of claim 1 of the formula ##STR17## wherein X is hydrogen,fluoro, hydroxy, loweralkoxy, arylloweralkoxy, acyloxy, loweralkyl ortrifluoromethyl;Y is hydrogen or loweralkyl; Z is hydrogen; R⁶ ishydrogen, arylcarbonyl, loweralkylcarbonyl, aryl(hydroxy)loweralkyl orhydroxyloweralkyl; and R⁹ is loweralkylcarbonyl, loweralkoxycarbonyl,phenylcarbonyl or carboxyphenylcarbonyl.
 3. The compound of claim 2whereinX is hydrogen, hydroxy, methoxy or phenylmethoxy; Y is hydrogenor methyl; R⁶ is hydrogen, aryl(hydroxy)loweralkyl orhydroxylloweralkyl; and R⁹ is t-butylcarbonyl, t-butoxycarbonyl,phenylcarbonyl or carboxyphenylcarbonyl.
 4. The compound of claim 3whereinX is hydrogen, 5-methoxy or 5-phenylmethoxy; Y is hydrogen ormethyl; and R⁶ is hydrogen, (2-fluorophenyl)hydroxymethyl or1-(hydroxy)ethyl; and R⁹ is t-butylcarbonyl, t-butoxycarbonyl,phenylcarbonyl or carboxyphenylcarbonyl.
 5. The compound of claim 4which is 2-[[(3-methyl-1H-indol-1-yl)amino]carbonyl]benzoic acid.
 6. Thecompound of claim 4 which is[3-methyl-N-[(trimethylacetyl)amino]]-1H-indole.
 7. The compound ofclaim 4 which is[2-[(2-fluorophenyl)hydroxymethyl]-3-methyl-N-[(trimethylacetyl)amino]]-1H-indole.8. The compound of claim 4 which is N-(t-butoxycarbonylamino)-1H-indole.9. A compound of claim 1 of the formula ##STR18## wherein X is hydrogen,chloro, bromo, fluoro, hydroxy, loweralkoxy, arylloweralkoxy, acyloxy,loweralkyl or trifluoromethyl;Y is hydrogen, loweralkyl, chloro orbromo; Z is hydrogen; and R⁶ hydrogen, chloro, bromo, arylcarbonyl orloweralkylcarbonyl.
 10. The compound of claim 9 whereinX is hydrogen,chloro, bromo, fluoro, hydroxy, methoxy or phenylmethoxy; Y is hydrogen,methyl, chloro or bromo; and R⁶ is hydrogen, chloro, bromo,methylcarbonyl, phenylcarbonyl, halophenylcarbonyl,methoxyphenylcarbonyl, methylphenylcarbonyl ortrifluoromethylphenylcarbonyl.
 11. The compound of claim 10 whereinX ishydrogen, 5-chloro, 5-methoxy, 5-hydroxy or 5-phenylmethoxy; Y ishydrogen, chloro, bromo or methyl; and R⁶ is hydrogen, chloro, bromo,methylcarbonyl, phenylcarbonyl, (2-methylphenyl)carbonyl,(2-methoxyphenyl)carbonyl, (2-fluorophenyl)carbonyl,(4-fluorophenyl)carbonyl, (3-fluorophenyl)carbonyl or(2-trifluoromethylphenyl)carbonyl.
 12. The compound of claim 11 which isN-(amino)-5-(methoxy)-1H-indole.
 13. The compound of claim 11 which isN-(amino)-5-(phenylmethoxy)-1H-indole.
 14. The compound of claim 11which is 2-(acetyl)-N-(amino)-3-(methyl)-1H-indole.
 15. The compound ofclaim 11 which is N-(amino)-2-(2-fluorobenzoyl)-3-(methyl)-1H-indole.16. The compound of claim 11 which isN-(amino)-2-(4-fluorobenzoyl)-3-(methyl)-1H-indole.
 17. The compound ofclaim 11 which isN-(amino)-2-[2-(trifluoromethyl)benzoyl]-3-(methyl)-1H-indole.